Marin Sais (born Mae Smith; August 2, 1890 – December 31, 1971) was an American actress whose career was most prolific during the silent film era of the 1910s and 1920s.

In 1910, at the age of twenty, Sais made her screen debut for New York City's Vitagraph Studios in the short film adaptation of William Shakespeare's Twelfth Night opposite the notable actors Florence Turner and Julia Swayne Gordon.

Sais would go on to star in a number of well-received comedy shorts for Kalem Company opposite actors Ruth Roland, Marshall Neilan and Edward Coxen.

Throughout the 1910s, Sais' career as an actress continued to build momentum and the actress showed her versatility by appearing in such varied genres as comedy shorts, Westerns, dramas, and beginning in 1915 she began appearing in a James W. Horne directed Kalem Company Nancy Drew-style mystery serial The Girl Detective, with such titles as: The Riddle of the Rings, The Secret Code, The Disappearing Necklace and The Vanishing Vases.

It was a trend that would follow Sais throughout her career into the talkie era of the 1930s and give her the dubious title of "Queen of the B-movie oaters".

Sais' acting career continued throughout the 1940s and into the 1950s, often in bit parts or in uncredited roles in poorly received, low-budget Westerns.